NE-8000 Series intelligent digital display controller (New product
in national class) General Description NE-8000 series digital display controller is an intelligent
digiltal display controller with auto-turning function developed by
our company. This series of instrument adopts the advanced
techniques and crafts of the single chip, SMT surface paste
mounting,switch power supply, dual-channel PID auto -turning
algorithm, electromagnetism computible design, etc. Features - Adopting large display screen, the insert depth of the instrument
is 105 mm and the size of surface panel meets the criterion of IEC.
- Adopting the forward-insert assemble structure manufactured by high
elasticity, metal shrapnel, replacing instrument is convenient.
- Adopting SMT technology, switch power supply, dual-channel PID
auto-tuning algorithm, electromagnetism compatible design with the
combination of hardware and software.
- Acquire the title of 'National Major-Product in year 2000'
gloriously.
Primary Technical Characteristics Input signal | Thermocouple:S,K,E,B,J,T,Wu-Re3-25 Resistance themometer sensor:Pt100,Cu50 Linear signal:0-10mV,0-50mV,0-10mA,4-20mA | Measurement error | ≤±0.5%F.S±1dig | Control type | On-off, time proportional,on-off PID,
dual-channel(heating/cooling)on-off PID | Dead band of theon-off control | 0.4~99.9℃ | Range of the P.I.D parameters for user's selecting | The proportional band for heating P=0~range of measturement(if P=0,
the control is in on-off type) Integrated time I=0-3600s (if
I=0,the control is in PD type) The proportional band in cooling
side P=10~1000%(Relative to the proportional band in heating side) |
Data tetention time | 10 years | Control output (The maximum number of channels is two:heating and
cooling) | Contacct type:3A/250VAC(for resistance load) Level type (for dribing SSR or control logic circuit):12VDC/30mA Standard current type:0-10mA (≤1kΩ or 4-20mA(500Ω)) | Alarm output (The maximum number of channels is two) | Contact capability 3A/250VAC (for resistance load) | Power supply | 85~264VAC 50~60HZ | Power consumption | ≤5VA | Anti-disturbance capability | ≥3class (IEC-61000-4) | Usage environment | Temperature 0~50℃,relative humidity≤85%, witheout corrosion and conductive dust. |
Model Series
Panel Layout 1.(PV) Display (red) - Display measurement value
- Display variety of prompt symbol according to the instrument status
2.(SP) Display (green) - Display set point
- Display varietyof parameters according to the instrument status
3. Indicators - Auto-tuning indicator(AT)(green), twinkle at operating
- Control output indication (OUT1)(green), bright at operating output
- Cooling control output indicator (OUT2)(green), lighting operating
output
- Alam output indicator(ALM)(red), lighting operating outpt
- Twinkle at continuous output in its range (OUT1)(green)
4. Function - Call out, update and confirm the parameters
5.6. Digit adjusting or auto-turning
entering key - Use to adjust digits and enter into the auto-tuning statue
Note: Take
the suface panel of ND-80000 model as an example,
it is largely identical but with minor differences for
other models. Wiring Diagram
Certification
Product application examples Food industry The application of thermostat in high
temperature box furnace The temperature control of high temperature box furnace heated by
silicon-molybdenum bar is required by the function of electric
furnace itself, the programing temperature controller is generally
used as the main control instrument. The executing section uses
thyristor trigger + thyristor + electric furnace transformer or SCR
power controller + electric furnace transformer, high power uses three phases to control. The following is a
brief analysis of the single-phase 380V thyristor control circuit
using "thyristor trigger + Thyristor + electric furnace
transformer" (see Figure 1) in the executing section:
It can be seen from the schematic diagram that the
program temperature controller receives the signal of thermocouple,
and on the other hand outputs a control signal (4~20mA) to the
thyristor trigger. The trigger receives the control signal and
compares it with the feedback signal (0~5A), then generates the
phase-shifting voltage regulating pulse to control thyristor, The
SCR controls the voltage of primary side (primary voltage) of the
electric furnace transformer, and the secondary side voltage
(secondary voltage) of the transformer heats the silicon-molybdenum
rods. as the characteristics of the system, we should pay attention
to the following points when choosing debugging instrument and
thyristor trigger: Programing temperature controller: - Does the number of program segments meets the requirements of
electric furnace? Are the start-up of measured values and other
special requirements needed?
- The B grading instrument should be displayed at room temperature
(generally between 0~200℃) in order to observe the status of
temperature rising during debugging
- Does the unit of time (min or SEC) of the program meets the
requirements of the electric furnace?
- Is the event prompt function needed? (such as a reminder after the
heat preservation time end, etc.)
- Does the alarm mode and alarm parameter setting meet the
requirements of electric furnace?
- The controller output shall be 4~20mA continuous signal;
- Shanghai Yatai' s NC-8838 and our XMTD-8000P series program
temperature controller have the above functions.
Thyristor trigger: - The input signal of the trigger should be matched with the program
temperature controller, which is 4~20mA;
- Because the resistivity of silicon-molybdenum rod is very small at
room temperature and it will increase rapidly with the temperature
increasing, current feedback trigger (0~5A) (namely current control
trigger) should be used;
- Since the thyristor controls the original side of the furnace
transformer (inductive load), the trigger pulse of the trigger
should be a phase-shifting trigger pulse with variable pulse width;
- The switching of trigger should be smooth between manual and
automatic.
- When the trigger is powered on again after off, it should be in the
state of output shutdown and waiting for manual debugging to ensure
there is no impact on the power again after the furnace temperature
drops if power off for a long time.
- It is better to have safety measures such as stop output when
overloading;
- our single-phase thyristor trigger NZK – 1L - l failed to meet all
the above features, but basically it can be used, except article 6)
The SCR power controller integrated with trigger and SCR is also
the development trend of electric furnace industry application, the
company should develop new more powerful SCR and SCR power
controller (similar to the shape of frequency converter) as soon as possible.
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